61777231 has 4 divisors (see below), whose sum is σ = 62100864. Its totient is φ = 61453600.

The previous prime is 61777229. The next prime is 61777249. The reversal of 61777231 is 13277716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61777231 - 2¹ = 61777229 is a prime.

It is a super-2 number, since 2×61777231² = 7632852540054722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61777211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161530 + ... + 161911.

It is an arithmetic number, because the mean of its divisors is an integer number (15525216).

Almost surely, 2^61777231 is an apocalyptic number.

61777231 is a deficient number, since it is larger than the sum of its proper divisors (323633).

61777231 is a wasteful number, since it uses less digits than its factorization.

61777231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323632.

The product of its digits is 12348, while the sum is 34.

The square root of 61777231 is about 7859.8492988097. The cubic root of 61777231 is about 395.3145622258.

The spelling of 61777231 in words is "sixty-one million, seven hundred seventy-seven thousand, two hundred thirty-one".